The CANSOLV&reg, System SO2 scrubbing technology is an emerging regenerable process for economical, highly selective capture of SO2 from gas streams, down to a few ppm if desired. In gas production and sweetening plants (GTU&rsquo,s), the technology can be used to control sulfur emissions from sulfur recovery units (SRU&rsquo,s), cogeneration units, and power boilers. The pure, water saturated SO2 byproduct from all these sources can be fed into a new or existing SRU for conversion to sulfur. Process costs with the CANSOLV&reg, System technology are largely insensitive to the concentration of SO2 in the feed gas. Therefore, high-sulfur, low-value fuels such as GTU flash gas can be burned in place of more valuable sweetened product natural gas.

Since the tail gas is incinerated in excess air prior to scrubbing, all sulfur species are
converted to SO2 and captured to minimize total sulfur emissions.

MACT status can be achieved -- to 10 ppmv SO2.

Troublesome streams such as SWS gas, and sulfur-laden waste streams which often plague
refinery SRU&rsquo,s may be directly incinerated, then recycled to the SRU as SO2 from the
CANSOLV&reg, Regenerator.

SRU capacity can be expanded at low capital and operating cost by feeding part of the acid
gas, preferably the troublesome streams such as sour water stripper gas and hydrocarbon rich
streams, to the tail gas Thermal Oxidizer. There, the excess air destroys species like ammonia
and hydrocarbons. Only the SO2 is removed from the combustion gases by the CANSOLV&reg,
System and is introduced to the SRU front end. This eliminates the flow of inerts (N2, CO2,
H2O) through the SRU that would be otherwise contributed by partial combustion of the
bypassed acid gas.

When acid gas bypass is maximized, a new process paradigm, the &ldquo,CANSOLV&reg, System
SRU&rdquo,, is created. This process configuration offers maximum sulfur recovery at minimum
cost, and allows processing of acid gas with lower H2S concentration.

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